I feel like listing them by game, because there's always one couple in each game I don't like, like they were just randomly paired together for no reason.
FoMT: ...I pretty much like all the couples. If I had to choose one...Rick and Karen. I married Karen and Rick's not happy for his sister anyway, so...BE LONELY FOREVER RICK! (My fav couple is Mary and Grey)
DS: ...Again, I liked all of these couples. If I had to choose...Carter and Flora. Just because they work together, they share a tent, and practically go everywhere together doesn't mean they should be a couple. Daryl and Flora might've been more interesting

(My fav couple is Rock and Lumina)
IoH/SI: I hated Pierre and Natalie. Natalie is like the pickiest eater in the game (will only eat fruit) so...why marry a gourmet?! (My fav couple in IoH is Sabrina and Vaughn, then it changes to Lily and Will when SI came out)
GB: Even though they don't get married, Angello and Daisy just seemed random. What do they have in common? Oh right, drawing. But that's it. I don't even see these two together very often (My fav couple is Dirk and Antoinette)
ToTT: Even though there are no official couples, all the Konohana couples seem random (Kana x Reina and Hiro X Nori, and yes, there are hints at those two couples liking each other) Kana and Reina don't really have anything in common and I guess Hiro and Nori's relationship could be similar to Jin and Anissa from ToT/AP. (My fav unofficial couple is Ash and Georgia)
ToT/AP: A lot of the couples are perfectly paired here...except Luke and Selena. Why those two together? Everyone has a perfect matchup and the leftovers have...each other. (My fav couple in ToT was Jin and Anissa, but it changed to both Kathy and Owen and Gill and Luna when AP came out)
Wow, I said a mouthful
